Computing device display screen or portion thereof with an icon



FIG. 1 is a front view of a computing device display screen or portion thereof with icon in accordance with a first embodiment; and,

FIG. 2 is a front view of a computing device display screen or portion thereof with icon in accordance with a second embodiment.

The outermost broken lines in the figures illustrate a display screen or portion thereof, and form no part of the claimed design. The remaining broken lines in the figures, including all text, illustrate portions of a graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a computing device display screen or portion thereof with an icon, as shown and described. 